Auth Injection Vulnerability in Meta Ads MCP by Pipeboard
CVE-2026-48039

9.1CRITICAL

Key Information:

Vendor

Pipeboard-co

Status
Meta-ads-mcp
Vendor
CVE Published:
7 August 2026

What is CVE-2026-48039?

Meta Ads MCP, developed by Pipeboard, contains a vulnerability in its Model Context Protocol (MCP) server allowing unauthenticated access to its tools. Prior to version 1.0.109, the method AuthInjectionMiddleware.dispatch() failed to issue a 401 response for unauthenticated Streamable HTTP requests. This oversight enabled any network-reachable caller to invoke MCP tools without valid credentials. When requests lacked credentials, tool handlers defaulted to using the META_ACCESS_TOKEN, risking exposure of sensitive data. Furthermore, failures in downstream Meta Graph API calls could lead to the serialization of the raw HTTP request URL, inadvertently disclosing the operator's access_token in the JSON-RPC response. Pipeboard has addressed this critical issue in version 1.0.109.

Affected Version(s)

meta-ads-mcp < 1.0.109

References

https://github.com/pipeboard-co/meta-ads-mcp/security/adv...
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https://github.com/pipeboard-co/meta-ads-mcp/releases/tag...
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https://github.com/pypa/advisory-database/tree/main/vulns...
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CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.